Some used, older edition textbooks are amazingly low-priced. The 1985 edition of Van Vlack's book can be purchased for $1 + shipping. I recommend the more comprehensive book by Callister. The 4th edition(1997) is at little as $2.43 + shipping. I use the following 2 book searches; AddALL is better for sorting , Campusi includes more sellers:
Elements of Materials Science and Engineering, 5th Edn., Lawrence H. Van Vlack, ISBN 0-201-08086-9, (1985), 633 pages.
Materials Science and Engineering: An Introduction , 4th Edn., William D. Callister, Jr., ISBN 0-471-13459-7, (1997) 852 pages.
METALLURGY FOR ENGINEERS, E. C. ROLLASON, no ISBN (1951, 1959, 1964) about 339 pages.
For basic metallurgy only (very simple theory), the following is about $3 + shipping.
Metallurgy Theory and Practice, Dell K. Allen, ISBN: 0826935001 (1969), 663 pages
A recent, inexpensive heat treating book that covers steels in detail and other metal rather briefly:
Heat Treatment Of Metals, Vijendra Singh, ISBN 81-86308-50-4 (1998) 588 pages; ISBN 8180140385 (2004) 643 pages.
And for advanced levels, I recommend:
Physical Metallurgy Handbook, ISBN 0-07-057986-5,
Anil Kumar Singh (2003) 1808 pages. Used prices are $44+, new is $55+.
For on-line information, the general content at
Key to Steel and
Key to Metals is mostly free. E.g., the Fe-C phase diagram: